Module: messages

Provides CQNS features.

The Command Query Notification Separation principle is a software design principle that separates the concerns of commands, queries, and notifications.

Message hierarchy:

• Message
  • Incoming / outgoing
    • Request (outgoing) -> response (incoming)
      • Command -> command status
      • Query -> query result
    • Notification
      • Incoming: notification -> commands
      • Outgoing
  • Event (internal)